ANCA-associated small vessel vasculitis (AASV) presenting as anemia and acute renal dysfunction.

AASV is an autoimmune disease with multiple-system involvement, which if untreated, carries a poor prognosis. The kidneys are the most common involved organ in these vasculitides. We present a case of AASV who presented with severe anemia and acute renal failure that was treated with steroids and cyclophosphamide.